often 1-2gpu mutch slower  then others 
conf all same i55, w8, rx580

[2018-11-29 23:05:11] GPU0 :    1101 H/s [T: 56c, RPM: 855, CC: 1290 MHz, MC: 2060 MHz][BUS:13]
[2018-11-29 23:05:11] GPU1 :    1103 H/s [T: 56c, RPM: 1226, CC: 1290 MHz, MC: 2050 MHz][BUS:6]
[2018-11-29 23:05:11] GPU2 :    1098 H/s [T: 57c, RPM: 892, CC: 1285 MHz, MC: 2050 MHz][BUS:12]
[2018-11-29 23:05:11] GPU3 :    1018 H/s [T: 56c, RPM: 1108, CC: 1290 MHz, MC: 2045 MHz][BUS:15]
[2018-11-29 23:05:11] GPU4 :    1103 H/s [T: 56c, RPM: 1122, CC: 1290 MHz, MC: 2050 MHz][BUS:10]
[2018-11-29 23:05:11] GPU5 :    1030 H/s [T: 56c, RPM: 1148, CC: 1295 MHz, MC: 2050 MHz][BUS:5]
[2018-11-29 23:05:11] GPU6 :    1099 H/s [T: 57c, RPM: 858, CC: 1285 MHz, MC: 2050 MHz][BUS:3]
[2018-11-29 23:05:11] GPU7 :    1000 H/s [T: 56c, RPM: 762, CC: 1270 MHz, MC: 2040 MHz][BUS:1]
[2018-11-29 23:05:11] GPU8 :    746 H/s [T: 56c, RPM: 800, CC: 1290 MHz, MC: 2050 MHz][BUS:11]
[2018-11-29 23:05:11] GPU9 :    1107 H/s [T: 56c, RPM: 900, CC: 1295 MHz, MC: 2060 MHz][BUS:4]
[2018-11-29 23:05:11] GPU10:    1105 H/s [T: 56c, RPM: 253, CC: 1285 MHz, MC: 2050 MHz][BUS:9]
[2018-11-29 23:05:11] GPU11:    1099 H/s [T: 56c, RPM: 884, CC: 1285 MHz, MC: 2050 MHz][BUS:14]
[2018-11-29 23:05:11] GPU12:    1103 H/s [T: 55c, RPM: 970, CC: 1290 MHz, MC: 2060 MHz][BUS:2]
[2018-11-29 23:05:11] Total:    13712 H/s